四格表资料的卡方检验时无需校正,应满足的条件是A.总例数大于40 B.理论数大于5 发布时间:2018-07-18 01:30 │ 来源:www.tikuol.com 题型:单项选择题 问题: 四格表资料的卡方检验时无需校正,应满足的条件是A.总例数大于40B.理论数大于5C.实际数均大于1D.总例数大于40或理论数大于5E.总例数大于40且理论数大于5
题型:单项选择题 如果函数f(x)在区间D上是“凸函数”,则对于区间D内任意的x1,x2,…,xn,有f(x1)+f(x2)+…+f(xn)n≤f(x1+x2+…+xnn)成立.已知函数y=sinx在区间[0,π]上是“凸函数”,则在△ABC中,sinA+sinB+sinC的最大值是( )A.12B.32C.32D.332 查看答案
题型:单项选择题 一 Did you hear that Li Hua was robbed during his recent trip to South Africa? 一 Yes, not only _____ his money, but he was nearly killed. [ ]A. he lost B. did he lose C. he had lost D. was he lost 查看答案
题型:单项选择题 多媒体技术中,图形格式一般有两类,即 (1) 和 (2) 。具体的存储方式有许多种,通常用图形文件的后缀名来区分,如以 (3) 为后缀名的,则是以ASCⅡ方式存储的图形;而 (4) 则不是图形文件的后缀名。(1)A.BMPB.PICC.WAVD.EXE 查看答案